What happens to Spitz at the end of their rivalry?

At the end of their rivalry, Buck kills Spitz in a climactic confrontation. This moment is significant because it symbolizes Buck's complete transformation from a domesticated pet to a powerful and instinct-driven creature, fully adapting to the harsh realities of the wild. The rivalry between Buck and Spitz represents the struggle for leadership within the pack, with Buck ultimately emerging as the stronger and more adept contender. This not only marks Buck's ascension to the position of lead dog but also highlights the primal instincts that have been awakened within him throughout his journey in the wilderness. The defeat of Spitz is emblematic of Buck's newfound strength and his acceptance of the call of the wild.